HiThey would have a very different setup. You would need 3 H bridges to control a brushless since each phase needs to be triggered separately.(In theory you could have one H bridge and get fancy with relays and signal routing).Also it is critical to measure the location of the rotor using the hall effects to know how to rotate the rotor.

This page pretty much explains everything that is there to develop brushless motor control. It has got theory, schematics and source code(of course, using Microchip components). You can order samples from Microchip too.